Buggy code:
public class Level { public int islandX ; public int islandY ; public int dimension ; public int width ; public int height ; public float ambientLight ; public float lightMod ; public boolean isCave = false ; public boolean isProtected = false ; public int groundTile = 0 ; public EntityManager entityManager ; public WireManager wireManager ; public int [ ] tiles ; public int [ ] objects ; public byte [ ] objectRotations ; public byte [ ] wire ; public byte [ ] lightLevels ; public byte [ ] particleLightLevels ; public short [ ] roomIDs ; public Biome biome ; public Region [ ] regions ; private int nextRoomID ; public int regionsWidth ; public int regionsHeight ; private boolean isRaining ; private long rainTimer ; public Level ( int width , int height , int islandX , int islandY , int dimension , boolean isCave ) { } public void repair ( ) { } public void calculateRegions ( ) { } public void calculateRooms ( ) { } public int getNextRoomID ( ) { } public int getRoomID ( int x , int y ) { <START_BUG> if ( ( ( roomIDs ) != null ) && ( ( ( ( x < 0 ) || ( y < 0 ) ) || ( x >= ( getWidth ( ) ) ) ) || ( y >= ( getHeight ( ) ) ) ) ) { <END_BUG> return roomIDs [ ( x + ( y * ( getWidth ( ) ) ) ) ] ; } SemiRegion s = getSemiRegion ( x , y ) ; if ( s != null ) return s . getRoomID ( ) ; return - 1 ; } public void setRoomID ( int x , int y , int roomID ) { } public Region getRegion ( int x , int y ) { } public SemiRegion getSemiRegion ( int x , int y ) { } public ArrayList < SemiRegion > getRoom ( int x , int y ) { } public long getSeed ( ) { } public int getWidth ( ) { } public int getHeight ( ) { } public void draw ( int x , int y ) { } private boolean inDrawRange ( int y , int drawY , int range ) { } public void tick ( float delta ) { } public void serverTick ( float delta ) { } public void tickMovement ( float delta ) { } public void tickRainTimer ( long globalTime ) { } public void resetRainTimer ( long globalTime ) { } public boolean isRaining ( ) { } public void setRaining ( boolean isRaining , boolean updateTimer ) { } public long getRainTimer ( ) { } public void setRainTimer ( long rainTimer ) { } public void updateAmbientLight ( ) { } public int getAmbientLight ( int x , int y ) { } public void setAmbientLight ( int x , int y , int lightMod ) { } public void updateLight ( int x , int y ) { } public void updateLight ( int x , int y , int dist ) { } public void updateLight ( int startX , int startY , int endX , int endY ) { } public int getLight ( int x , int y ) { } public void setLight ( int x , int y , int lightMod ) { } public void updateParticleLight ( int x , int y , int dist ) { } public void updateParticleLight ( int startX , int endX , int startY , int endY ) { } public int getParticleLight ( int x , int y ) { } public void setParticleLight ( int x , int y , int lightMod ) { } public int getCombinedLight ( int x , int y ) { } public void drawLight ( int startX , int endX , int startY , int endY ) { } public float getFloatLight ( int x , int y ) { } public float getRealLight ( int x , int y ) { } public float getRealLightInvert ( int x , int y ) { } public float getLightLevel ( int x , int y ) { } public Tile getTile ( int x , int y ) { } public int getTileInt ( int x , int y ) { } public String getTileName ( int x , int y ) { } public String getObjectName ( int x , int y ) { } public void setTile ( int x , int y , int tile ) { } public Object getObject ( int x , int y ) { } public int getObjectInt ( int x , int y ) { } public byte getObjectRotation ( int x , int y ) { } public void setObjectRotation ( int x , int y , byte rotation ) { } public boolean [ ] getAdjecentTilesBoolean ( int x , int y ) { } public int [ ] getAdjecentTilesInt ( int x , int y ) { } public Tile [ ] getAdjecentTiles ( int x , int y ) { } public Object [ ] getAdjecentObjects ( int x , int y ) { } public int [ ] getAdjecentObjectsInt ( int x , int y ) { } public boolean isShore ( int x , int y ) { } public ArrayList < Rectangle > getCollisions ( Rectangle him ) { } public boolean collides ( Rectangle him ) { } public ArrayList < Rectangle > getCollisions ( Line2D line ) { } public boolean collides ( Line2D line ) { } public Point2D getCollisionPoint ( ArrayList < Rectangle > col , Line2D l ) { } public Point2D getCollisionPoint ( Line2D l ) { } public boolean isSolidTile ( int x , int y ) { }

Fix:
if ( ( ( roomIDs ) != null ) && ( ! ( ( ( ( x < 0 ) || ( y < 0 ) ) || ( x >= ( getWidth ( ) ) ) ) || ( y >= ( getHeight ( ) ) ) ) ) ) {